| I'm not a plummer, but once a similar situation happened to me.
It could be in the trap of your toilet.
Once we had to replace a toilet, there was a key in the toilet's trap that had been there for a very long time.
Had another toilet problem once because my son flushed some small toys down, each one were in the trap when the plummer took up the toilet.
(actually, the plummer found the key. we took the toilet up ourselves to get the toys out - it wasn't that hard)
I hope you find it. Call a plummer to take up the toilet.
The ring is probably heavy enough that it's still in there. | 
Linear Mode
